Abstract
Facilitated transport of silver across a bulk liquid membrane was studied in a rotating film (RF) pertraction device. A 0.06 M solution of tri-isobutylphosphine sulfide (TIBPS) (Cyanex® 471x) in n-octane was used as a carrier and an aqueous ammonia solution as a stripping phase. The influence of the main process parameters such as temperature, disc rotation velocity and nitric acid concentration was investigated as well as the separation selectivity with respect to other metals such as Cu, Zn and Ni present in the feed solution. It was shown that the RF-pertraction using TIBPS as a carrier was a successful method for selective silver recovery from its dilute nitrate solutions.
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